Sand-blast tumbler



s. co'BuRN.

SAND BLAST TUMBLER.

APPLICATION FILED DEC. 8. |919.

Patented June 15, 1920.

INVENTOR .S4/WEL Cosa/2N ATTORNEY UNITED STATES y PAT ENT' oFFICE.

' SAMUEL COBURN, or lBIRMI'NerHAur, ALABAMA.

SAND-BLAST TUMBLER.

vented certain new and useful Improvements.

in Sand-Blast Tumblers, of which the fol?I Y rlowing is a specification.

My invention relates to a tumbler equipped with a novel sand blastmechanism, thefchief characteristic of which the provision of a vhousingor protecting pipe or cover. for the sand blast pipes arrangedconcentric with the tumbler and readily removable with the sand blastpipe through the tumbler trunnions without interrupting the operationof. the tumbler. The sand apparatus can thus be removed, inspected,repaired and replaced without requiring the tumbler to be dismounted andin fact the changes can be made Without stopping the tumbler. Inaccordance with my arrangement the tumbler is provided withhollow'trunnions at either or both ends and the air blast guard orprotector is detachably mounted in separate bearings or bracketstherefor at each end of the tumbler'.

My invention also comprises the novel details of construction andarrangements of parts, which in their preferred embodiment only areillustrated in the accompanying drawings which form a part of thisspecification, and in Which:-

Figure 1 is an enlarged vertical sectional View through the tumbler.

Fig. 2 is a cross sectional View of a modified arrangement of the sandblast nozzles in the guard pipe.

Fig. 3 is a sectional view taken through the line 3 3 of Fi 2; and

Fig. 4 is a simi ar sectional View taken through a modified type ofguard for theV sand blast pipe.

Similar reference numerals refer to simi` lar parts throughout thedrawings.

As illustrated in the drawings,"'1 represents formally any standard typeof round, steel-plate, barrel tumblers having heads 2 at each end towhich are attached hollow trunnions 3 which turn in bearings 4, thetumbler being driven by a s ur gear 5 meshing with a driving gear Fnotshown), or may be driven in any manner commonly practised in this art.Thetumbler is provided with one or more perforatedplates 7 for theescape of surplus sand, this perfo- Speeication of Letters Patent.

Patented June 15,1920.

Appiicationnied December s, 1919. serial No. 343,34e.

rated section of the drum being covered outside of the body of thetumblerby a steel pocket 8 so constructed that it will collect anddischarge the sand in the boot of an ele' -vator not shown, or anysuitable conveyer.

A pipe 9 leading from any suitable source of compressed air and sandserves to "deliver the mingled air and sand through a blast pipev 10 ateach end of `the tumbler, each pipe 10 beingconnected by a coupling 11to a guard pipe 12 in which the sand blast pipe i 10 is mounted, thisguard pipe being mounted at each end in bracket supports 13 disposedadjacent to the bearings 4 and preferably mounted on the same bearingbases 11. v

with said bearings. The pipe 12 extends from end to end through thetrunnions 3 and heads 2 of the drum and through a duct collecting pipe15 with which the adjacent drum trunnion is adapted,'in its normaloperation, to rotate free 'of frictional contact. A sand blast nozzle 16von the end of each pipe 10 is arranged in the guard pipe 1'2oppos1tesand blast ports 17 in the, underside of the guard pipe. The nozzles fitslidingly in the guardpipe andl both supportv and center the sand blastpipes therein.

I have shown the supply pipe 9 and blast pipe 10 as formed integrally,but this is not essential. In such an arrangement the coupling 11comprises a disk 18 which has a central hole to receive and center theblast pipe in the guard pipe, this plate 18 being bolted to a ring 19adapted to screw on the end of the guard pipe so as to be readilydetachable, 4in which case the nozzle and blast pipe vcan be drawn outof the guard pipe and the guard pipe slipped endwise out of its bearins.

-In Fig. 2 show a modified arrangement with the supply pipe enteringonly one endv of the tumbler drum. Here the blast pipe 10 is closed atits outer end by a flange plug 20, which forms a support and guideforthe pipe at its inner end while its other end, if needed, may be'supplied' with a centering flange 21. The blast pipe is formed insections with interposed screw coupling sleeves 22, each of Vwhich isprovided with a sand blast nozzle 23 and as Worn the nozzle couplingscan be removed and replaced. They are arranged opposite the sand blastports 17 in the guard pipe 12, which is mounted as in Fig. 1, or in anyother suitable manner in the drum.

As shown in Fig. 4 the guard may be in the shape lo f-aninvertedangleiron 2 4 in stead of thepipe, the ironfbeing bolted to thebrackets 13 or otherwisel detachably securedA in'place. Clips 25 serveto mount thesand blast pipe ,10i in thelapex of theangle iron 24;.Thepipe 12 Vor guard'l: serve to protect the sand blasUsfpipe--fandnozzles: romfdame age lfrom the castings in the tumbler and `-being'disposed-concentric'with the drum the guard 'and lsand `blastfpipe' orpipescanrbe removed' togetherat any time desiredv 'by 'Y di'smount'ingthe Acoupling '1l from'the pipe l2 anddraWing-thelatterendivise through the d'ruin', Acarijvin'gfwith it tl;'viozzlebearingend --of the sandrpil'i, thus per- Y -mitti'ngfthel'atterito be'fwfiQffmouI-ited, repaired* 'and replaced" Withoutinterrupting Y the "operation'of the.` tumbler.

` ters Patent7 -is 'f The-Sand jblast can be applied from either endof'the machine' mostconvenient, and the most `'iinportz'mt feature of myinvention is the simplieity'and ease with which the sand blast cani'be"repaired l andthe inexpensive. l characterof itsc'onstruction andmanner'of mounting;

f VHaving thus described my invention, what I claim as new land desireto secure by Let- `1; In a tumbler, a drumhaving end trunnions, one 'atleast of Which is hollow, a lguard''adapted to be passed through thehol- 'low' trunnion anddisposed substantially .cen-

tr'ally'l through the drum, means to ixedly support the ends of saidguard, and a sand. blast pipe"V entering `the drum through a trunnionandprojecting thereinto under and in position to be protected bytheguard,

said pipe having a sand blast nozzle, there being an aperture inthe-guard opposite said sandblast nozzle,'substantiallyas de- 2.. Atumbler mountedy to turn on hollow trunnions, trunnion bearings, a sandblast pipe entering vthe tumbler through an end trunnion, .and a fixedguard for said sand blast pipey mounted externally and inde- .pen'dentlyofthe drum andA projecting centrallyrv into vthev .drum through atrunnion thereof. v o 3. "The combination 4in, a tumbler, of adrulnhaving hollovs7V end trunnions, end bearings forv `the ltrunnions,a Aguard projecting substantially centrally through the drum and throughits trunnions but free of Y engagement therewith, external bracketsupportsv for theguard, Ia sand blast pipe projecting through .thetrunnions into the drum guard, and'means to support said pipe from theguard, said `guard and pipe being removable ndependentlyof the drumthrough its trunnions.` l v Inftestimony whereof Iaixmy si nature.

Witness: v

.,NoMm WELSH.

in position to be protected overhead by said v SAMUEL COB RN.

